Sea Blue Restaurant Game

Unusual restaurants are your most favorite dishes. You always look for the restaurants with the most unique concepts. Then you saw the sign outside the restaurant saying "Enter at your risk, leave not on your own accord." You find it amusing. You can't help but chuckle as you enter. Upon entering, you saw pretty normal people inside. You walk towards the tables and sat down. You ordered a meal and waited for something unusual to happen. Then you have already finished your meal but still nothing unusual happened. So you went to the cashier to pay. However, she needs specific coins found somewhere inside the restaurant. You tried interacting with the other people and they all need something somewhere inside. Then the saying became clear and the unusual restaurant surfaced.